Find Microsoft Excel help and learning resources. Explore how-to articles, guides, training videos, and tips to efficiently use Excel.

Issues that are fixed in this update. The following issues are fixed for .NET Framework 4.7.2. SQL Server (SQL) Fixes an issue in which the .NET Framework API SqlConnection.ConnectionString property is used to set a null or empty connection string. In this situation, a Null Reference Exception (NRE) occurs when you use the API together with .NET Framework 4.7.2.

如果你忘记了 PIN 并需要重置它，可以从 Windows 登录屏幕进行重置。 查看 PIN 文本框下方： 如果看到 我忘记了 PIN ，请选择它，然后按照说明重置 PIN。 如果设备上有多个帐户，请选择需要重置的帐户。

Customize the reading pane. The reading pane, sometimes called the preview pane, lets you read items without opening them. You can customize the reading pane according to your preferences.

Microsoft account help and support. Get help with signing in, locked or compromised accounts, linked accounts, closing, reopening, and updating your security info and account profile.

Check the cables (for wired printers). Make sure that the printer's USB cable is properly connected from the printer to your PC. If your USB isn’t recognized, see Automatically diagnose and fix Windows USB problems. Check the wireless connection (for wireless printers).Do one of the following:

Notes: If you're using the desktop version of Excel on a Windows PC, see this Excel Quick Start.. If you're using the desktop version of Excel on a Mac, see Office for Mac Quick Start Guides and Excel for Mac Help.

为空格添加下划线 可以通过按 Shift+连字符 ( ) 来为空格添加下划线，但很难将下划线对齐（例如，如果要创建填充窗体）。 此外，如果打开用于将下划线字符更改为边框线的自动套用格式选项，则按 Shift+连字符 ( ) 行中三次或多次将导致一行扩展段落宽度的行，这可能不是你想要的。

了解文件扩展名是什么、Windows 中有哪些常见的扩展名，以及如何在“文件资源管理器”中查看它们。 Windows 文件名包含由句点分隔的两个部分：第一部分是文件名，第二部分是定义文件类型的三字符扩展名或四字符扩展名。

Scenario. Description. Recommended Solution. Add Teams meeting add-in for Outlook. Helps fix the issue where teams meeting add-in is missing or is not loaded, preventing you from creating teams meeting from Outlook.